Encyclopaedia Britannica : volume 7
Encyclopaedia Britannica Inc., 1967
 Buku Referensi
Encyclopaedia universalis : volume 7
Encyclopaedia Universalis France S.A. , 1989
 Buku Referensi
The New Encyclopaedia Britannica : volume 7
Encyclopaedia Britannica Inc., 1988
 Buku Referensi
The New Encyclopaedia Britannica : volume 7
Encyclopaedia Britannica Inc., 2003
 Buku Referensi
The New Encyclopaedia Britannica : volume 7
Encyclopaedia Britannica Inc., 1983
 Buku Referensi
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